Add domain_variants helper to DomainNormalizable concern (#38539)

app/models/concerns/account/attribution_domains.rb

@@ -12,8 +12,7 @@ module Account::AttributionDomains
   end
 
   def can_be_attributed_from?(domain)
-    segments = domain.split('.')
-    variants = segments.map.with_index { |_, i| segments[i..].join('.') }.to_set
+    variants = self.class.domain_variants(domain).to_set
     self[:attribution_domains].to_set.intersect?(variants)
   end
 end

app/models/concerns/domain_normalizable.rb

@@ -17,6 +17,11 @@ module DomainNormalizable
         SQL
       )
     end
+
+    def domain_variants(domain)
+      segments = domain.to_s.split('.')
+      Array.new(segments.size) { |i| segments[i..].join('.') }
+    end
   end
 
   private

app/models/domain_block.rb

@@ -69,9 +69,7 @@ class DomainBlock < ApplicationRecord
       return if domain.blank?
 
       uri      = Addressable::URI.new.tap { |u| u.host = domain.strip.delete('/') }
-      segments = uri.normalized_host.split('.')
-      variants = segments.map.with_index { |_, i| segments[i..].join('.') }
-
+      variants = domain_variants(uri.normalized_host)
       where(domain: variants).by_domain_length.first
     rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
       nil

app/models/email_domain_block.rb

@@ -67,9 +67,7 @@ class EmailDomainBlock < ApplicationRecord
       @uris.flat_map do |uri|
         next if uri.nil?
 
-        segments = uri.normalized_host.split('.')
-
-        segments.map.with_index { |_, i| segments[i..].join('.') }
+        self.class.module_parent.domain_variants(uri.normalized_host)
       end.uniq
     end
 

app/models/preview_card_provider.rb

@@ -36,7 +36,6 @@ class PreviewCardProvider < ApplicationRecord
   scope :not_trendable, -> { where(trendable: false) }
 
   def self.matching_domain(domain)
-    segments = domain.split('.')
-    where(domain: segments.map.with_index { |_, i| segments[i..].join('.') }).by_domain_length.first
+    where(domain: domain_variants(domain)).by_domain_length.first
   end
 end